Industrial camera back focal length adjustment
2021-03-31 08:01:58
The industrial camera back focal length, also known as the back focus, means that when the standard lens (standard C/CS interface lens) is mounted, the image of the subject can be exactly formed on the target surface of the CCD image sensor. Generally, the industrial camera has been properly adjusted for the back focus when it is shipped from the factory. Therefore, in the application of the fixed-focus lens, it is generally unnecessary to adjust the back focus of the industrial camera.
In some applications, it may happen that when the lens focus ring is adjusted to the extreme position, the image cannot be made clear. In this case, you must first confirm that the lens interface is correct. If the confirmation is correct, the back focus of the industrial camera needs to be adjusted. According to experience, in most applications where industrial cameras are equipped with motorized zoom lenses , it is often necessary to adjust the back focus of industrial cameras.
The adjustment steps for the back focal length of an industrial camera are as follows:
1. Mount the lens correctly on an industrial camera;
2. Open the lens aperture as far as possible (the purpose is to narrow the depth of field to accurately find the imaging focus);
3. Push the lens to the telephoto state by ZoomIn (ZoomIn), take a close-up of an object other than 10m, and then adjust the focus to make the close-up image clear;
4. Perform the zoom adjustment ( ZoomOut ) opposite to the previous step to pull the lens back to the wide angle state. At this time, the screen changes to a panoramic image containing the above-mentioned close-up object, but the focus adjustment cannot be performed at this time (Note: If At this time, the image becomes blurred and the focus cannot be adjusted, but the next focus adjustment is prepared;
5. Loosen the hexagon socket screw of the industrial camera front end for fixing the back focus adjustment ring, and rotate the back focus adjustment ring (for the camera without the back focus adjustment ring, directly rotate the lens to drive its built-in rear focus ring) until Before the picture is clearest, then temporarily tighten the hexagon socket head cap screws;
6. Re-push the lens to the telephoto state to see if the close-up object just shot is still clear. If it is not clear, repeat steps 1, 2 and 3 above.
Usually only one or two rounds can be used to adjust the back focus. Finally, tighten the hexagon socket head cap screws to adjust the aperture to the proper position.
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